The point gap on a Yamaha DT250 should be between 0.016 and 0.020 inches. This gap is important for ensuring that the points open and close properly, which in turn affects the timing of the spark. If the gap is too small, the points will not open far enough and the spark will be weak or nonexistent. If the gap is too large, the points will open too far and the spark will be too strong, which can damage the points and other components.
To adjust the point gap, you will need a feeler gauge. Insert the feeler gauge between the points and turn the adjustment screw until the gauge just fits snugly. Be sure to check the gap on both sets of points.
